The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted from Hypnea bryoides
Joint Authors
Al-Alawi, Ahmed
Al-Marhobi, Insaaf
Al-Nahdi, Zainab Mohammed
Source
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-08-01
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Earth Science , Water and Environment
Abstract EN
Hypnea bryoides collected from the Arabian Sea on the southern coast of Oman was investigated for κ-carrageenan optimal extraction conditions.
The effects of different conditions of alkali treatment (4, 6, and 8% w/v NaOH), temperatures (70, 75, and 80°C), and time (2, 2.75, 3.5 hours) on carrageenan yield and chemical and thermal properties were evaluated.
Yield was significantly affected by alkaline concentration and temperature, with highest value of 26.74 ± 5.01%.
Molecular weights of the extracted carrageenan were significantly reduced by increased temperatures and ranged from 5.95 ± 0.49 × 105 Da to 13.90 ± 0.14 × 105.
FTIR showed that samples under all extraction conditions were similar and confirmed the presence of κ-carrageenan with no traces of μ-precursor.
Sulfate content was also significantly reduced by alkaline concentration (from 4% to 6%) and ranged from 7.62 ± 5.52% to 17.02 ± 0.14.
Thermal properties showed more sensitivity towards temperature and alkaline strength parameter than time.
In addition, melting and gelling temperatures were significantly correlated with the molecular weight, but not sulfate content.
In conclusion, mild extraction conditions were found to be more efficient in introducing the intended structural modification while getting the highest yield and quality.
American Psychological Association (APA)
Al-Nahdi, Zainab Mohammed& Al-Alawi, Ahmed& Al-Marhobi, Insaaf. 2019. The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted from Hypnea bryoides. Journal of Marine Sciences،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1181461
Modern Language Association (MLA)
Al-Nahdi, Zainab Mohammed…[et al.]. The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted from Hypnea bryoides. Journal of Marine Sciences No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1181461
American Medical Association (AMA)
Al-Nahdi, Zainab Mohammed& Al-Alawi, Ahmed& Al-Marhobi, Insaaf. The Effect of Extraction Conditions on Chemical and Thermal Characteristics of Kappa-Carrageenan Extracted from Hypnea bryoides. Journal of Marine Sciences. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1181461
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1181461